Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1986-05-23
1988-03-22
Kashnikow, Andres
Brakes
Wheel
Axially movable brake element or housing therefor
188 7339, F16D 6514, F16D 6538
Patent
active
047322420
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a spot-type disc brake for vehicles, comprising a brake carrier which straddles the edge of a brake disc, a pair of brake pads arranged at one side each of the brake disc and guided at the brake carrier, an actuator having an actuating axis defining a radial center plane together with the axis of the brake disc, a pair of guide bolts arranged at the brake carrier at least approximately parallel to the axis of the brake disc at that side of the center plane which is the trailing side based on the direction of rotation of the brake disc during forward travelling, a caliper guided for displacement by the guide bolts, the actuator acting directly on the one brake pad and by way of the caliper on the other brake pad, and the brake carrier comprising effective guide faces for the brake pads upon braking during forward travelling at the trailing side only, while the caliper comprises support faces for the brake pads effective upon braking during backward travelling.
In spot-type disc brakes of this kind the peripheral forces which act on the brake pads upon braking during forward travelling are transmitted directly to the brake carrier by the guide faces mentioned.
In a known brake of the same generic kind (EP-A 011 94 66) both brake pads are supported by a projection each on the support faces of the caliper and simultaneously by a shoulder each on a guide face of a brake carrier upon braking during backward travelling. The peripheral forces accommodated by the caliper are transmitted to the brake carrier by way of the guide bolts.
These peripheral forces exert a moment on the caliper likewise to be transmitted by the guide bolts to the brake carrier. This moment tends to tilt the caliper about an axis which is normal to the axis of the brake disc and the actuating axis and it may lead to bending deformation of both guide bolts if the peripheral forces are especially great when braking during backward travelling. The displaceability of the caliper may suffer from such deformation of the guide bolts.
It is the object of the invention to develop a spot-type disc brake such that hard braking is permissible even during backward travelling without impairing the displaceability of the caliper.
This object is met, in accordance with the invention, in a spot-type disc brake of the kind defined initially in that the brake carrier and the caliper are interconnected by an additional sliding connection at the side opposite the brake actuator and effective upon braking during backward travelling to relieve the guide bolts at least in part of moments of the caliper in respect of an axis which is normal to the axis of the brake disc and the actuating axis.
In this manner part of the peripheral forces occurring upon braking during backward travelling and above all their moments regarding the latter axis are transmitted by the caliper to the brake carrier by way of the additional sliding connection. Consequently the guide bolts should not suffer any deformations which might impair the displaceability of the caliper. Even if extremely great peripheral forces should occur upon braking during backward travelling, there is reduced risk that the guide bolts be deformed permanently, let alone be pulled out of their fastening locations.
The additional sliding couple may be formed in especially simple manner by a bolt and a bore. The bolt is firmly connected to one of the two structural members, namely the brake carrier or the caliper to transmit peripheral forces and moments, and the sliding couple results from the fact that a portion of the bolt engages in a bore formed in the other structural member.
It proved to be convenient to arrange the bolt with clearance all around in the corresponding bore but offset eccentrically forward with respect to the bore in the direction of forward rotation of the brake disc. This will assure that contamination and corrosion do not impede the displaceability of the caliper while, on the other hand, the additional sliding connection becomes effective upon braking during backwar
REFERENCES:
patent: 4061209 (1977-12-01), Gee et al.
patent: 4350229 (1982-09-01), Ito et al.
Kashnikow Andres
Lucas Industries Public Limited Company
Potosnak Richard
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